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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.27: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
A compact nonlinear interferometer for spectroscopy with undetected photons in the mid-infrared — •Theresa Kloß1, Helen M. Chrzanowski2, and Sven Ramelow3 — 1Humboldt-Universität zu Berlin — 2Humboldt-Universität zu Berlin — 3Humboldt-Universität zu Berlin
Infrared spectroscopy is a powerful workhorse of science and industry. Over the past decade, quantum optics has offered a new approach to infrared sensing with quantum nonlinear interferometry allowing us to decouple the sensing and detection wavelengths. However, the practical implementation of this technique is often limited by strong absorption from components of the ambient air, such as H2O(g) or CO2(g). Here, we demonstrate a compact implementation of a nonlinear interferometer for mid-IR spectroscopy, successfully mitigating the impact of gaseous H2O(g) and allowing the successful characterization of a chrysotile asbestos sample in the wavelength range from 2.68 µm to 2.77 µm.
Keywords: mid-infrared spectroscopy; nonlinear interferometry; quantum sensing